This would be another evidence, that they really thought
they are all cloned from humans "from the gutter".
BTW: The so-called "porn magazine" looked more like an
innocent nude photo magazine (David Hamilton style).
Porn is something else entirely.
On the book Kathy explains to Tommy that she was looking for her possible in the magazine I think.
She goes on to say that it wasnt something like she was serious about the possible idea but that she and other donors liked to think about it from time to time, how their life could have been if they hadnt been raised as donors...
She points out only younger students liked to talk about possibles since the older ones pretty much give up hoping for a better life when their donations are upon them.
Even ruth that wanted to act all grown up when they were in the cottages was interested on the idea of a different life and thats why they end up going on a trip to see a possible for her